Theorem’s plot finds Waltz as a genius computer hacker obsessively working on a way to discover the reason for human existence – or lack thereof. It’s all set in a world ruled by a strange entity known as 'management', where the alluring Thierry quickly becomes a distraction.

Now Damon is aboard, playing a character with a shock of white spiky hair. Which will be a challenge, because Damon recently shaved his head for additional shooting on Neill Blomkamp’s Elysium. But, as he told Vulture, that was no setback for Gilliam.

“I'm just doing a very small part in it," explained Damon. "Someone finally gave him money to do this one, thank God. I'd do anything for Terry. It's been ten years since I last worked with him.

“I wrote Terry this whole email, because we had this whole conversation about what the character would look like, because the story takes place in the future, but he had a specific look that he wanted, but then I had to shave my head and I said, ‘Terry, what should we do?’ And he said, ‘Actually, we can take advantage of the fact that your head is shaved. Why don't we change your hairline?’ So he mocked up a picture and sent me a real receding hairline, with white spiked hair.”

Gilliam will be shooting Theorem next month in Romania and with Damon aboard, we’re even more eager to see what he’s cooked up this time.

I liked Brothers Grimm, and more Gilliam is always something to get excited about. We have to wait too long between films from the great man, and he's not getting any younger. I still want to see The Defective Detective. I wonder if that will ever materialise? More